The Angels singer, his pregnant wife Ayda and their toddler Teddy attended a special ceremony hosted by local dignitaries on Tuesday (01Jul14).
He kept the event low-key so as to surprise his parents, who joined him at the Town Hall.
Williams told fans, "It's been a special day for Ayda and I and I am very grateful to those involved, especially to the Lord Mayor, for this honour.
"There is a saying that it takes a village to raise a child. This particular village moulded me into the man I am today. I wear where I am from as a badge of honour. So to have that honour returned to me is very special.
"I'm proud of our six towns. I'm proud to come from Stoke-on-Trent. I'm extremely honoured and grateful that you think it's fitting to give me this recognition. God bless you all."
He was presented with an honorary scroll by Mayor Majid Khan.